mathiasbynens/jquery-placeholder — comment on commit 4cafa16507dfdfb163b8f3a6f13f9ddb9ccb2217
File:  line 0
By yuryromanov:

I found an interesting conflict with a jquery.datepicker: when a user clicks on the link link then IE (and only IE) generates an event 'onbeforeunload' and the "placeholders" plugin clears all placeholders.
Solution: change links in jquery.datepicker with link